Revolving-cylinder and reciprocating-piston pump



Dec. 18, 1928.

i E. PELICH REVOLVING CYLINDER AND RECIPROCATING PISTON PUMP Filed Oct.26, 1925 Patented Dec. 18, 1928.

UNITED STATES ED'UABD PELICH, 0] PRAGUE, CZEGHOSLOVAKIA.

nnvonvme-cnm'nnn AND nnorrnoonrmo-rrsron rumr.

Application filed October 26, 1925, Serial No. 84,942, and inCzechoslovakia October 27, 1924.

The present invention relates to umps for liquld and gaseous materlalsof t e rotary-cylinder and reciprocatingiston type.

There are known pumps in w 'ch a number of hollow prismatic bodies sliderelatively to each other within the ho]low space of the main pump body,working spaces of varying volume being produced between the slidingbodies by means of'a shaft havm an eccentric journal. This shaft isforme with inlet and outlet passages which o en into suction anddischarge grooves prov1 ed in the eccentric 'ournal. The two groovescommunicate wit the working spaces of the pump by passages provided inthe body or casing in which the shaft rotates.

According to another known arrangement istons of circular section arecarried by a ollow .frame which slides in two slideways of a rotatingdisc. The pistons move m a central body rotatable 'upon an eccentricallymounted journal so that the several working spaces communicate withsuction and discharge passages' arranged in the 'ournal which alsocommunicates with'the i et and outlet passages of the pump.

The object of the present invention is to provide a construction whichafiords certain advantages owing to the fact that the eccentric journalis arranged stationary but is adjustably mounted in thecasing so that byturning said journal the capacity or rate.

of discharge of the pump may. be varied. The distributing valveis,arranlged upon the eriphery of a rotating disc w ich revolves 1n thedistributor'casing, which enables the sections of the suction anddischarge passages'tobe made comparatively. large and moreoversimplifies the construction and connection of said passages. Thisadvantage of the external arran ement of the distributing valve isparticu a'rly important in the of very small pumps.

ca fine construction embodying the features of the invention is shown inthe accompanyin drawings in which: 7 v

ig. 1 is partly a central cross section and partly an end view of thepump, a

Fig. 2 is an .axial section showing the eccentric tion. .I

Fig. 3 illustrates the annular distributing device in section and themanner of adjusting the capacity of the pump by altering the position ofthe eccentric ournal.

journal in its lower or zero posi- 2 operable by means of an externalshaft, or

the like. The .disc 1 is provided with a central prismatic hollow'space3. In this hollow space is adapted to slide a quadrangular frame 4. Aprismatic body 5 is ada ted to slide in the frame 4. A prismatic b y 5which may act as a pump plunger is rotatably mounted upon a stationaryjournal 6 which is mounted eccentrically in relation to the axis of thedisc 1 in a cover 7 of the casing. The axes of the journal 6 and thedisc 1 are parallel to each other, A pointer 8 playing upon a scale 9arran ed upon the outside of the cover 7 is fixed ly connected to thejournal 6.

During the rotation of the disc 1 the two inner members 4 and 5 areconstrained to rotate about the journal 6, this rotation producingsliding motion of the member 5 within the member 4 and sliding motion ofthe member 4 within the disc 1. Thetwo sliding motions are at rightangles to one another and correspond to components of a sine line. Owingto the sliding movement of the members 5 and 4 four working spaces a, b,a, d of varying-volumes are produced. These working spaces are connectedby passages 11, 12, 13 and 14 with the outer periphery of the disc 1.The passages of the working spaces a, d are constltuted b bores 13, 14of circular section formed in t e disc 1 and by oval'openings 15, 16 inthe frame 4. The passages 11, 12 of the working spaces a, b areconstituted by radial bores in t e member 1. The disc 1 is adapted torotabs in a distributor sleeve 17 which is fixedly mounted in the pumpcasing 18 and is provided with two oppositely arranged peripheral slots19, 20 the slot 19 being in communication with the suction union 21 andthe slot 20 being in communication with the discharge union 22 of thepump casing 18. The working spaces of the pump therefore communicatealternately with the suction 21 and discharge 22.

The capacity of the pump may be adjusted in two ways:

- According to the first method of adjustment, the journal 6 is turnedin a bore of the cover 7 which is arranged concentrically to the axis ofthe disc 1, as indicated in discharged. If the journal 6 be shi t're ofthe journal 6. On rotating the disc 1 in the direction of the arrow, 19will constitute the suction passage of the distributor sleeve 17 whilst20 will constitute the discharge passage. If the line p0 coincides withthe line ij which is the centre line of the distributing sleeve 17, thecapacity of the pump is a maximum inasmuch as the total quantity drawnin by the pump is also the position 0', the working spaces of the pumpwill still be in the suction period although they hitve passed theposition a: and have been brought into communication with the dischargepassage 20, so that the pump will draw fluid from the discharge endduring a portion z, i of its suction stroke. Similarly, theworkingspaces will communicate with the suction passage 19 at the end ofthe pressure stroke after passing the position j, so that the pump willdischarge back into the suction passage during a portion j, j of thepressure stroke. If the journal G'be turned through 90 that is into theposition 0, the capacity of the pump will be nil, the amount drawn inbeing equal to the amount discharged back into the suction. On turning.the journalbeyond the position 0, the suction passage w1ll be convertedinto the discharge passage and the discharge passage will act as thesuction passage. The capacity of the quantity discharged by the pump istherefore determined by thev pos,i-'

tion of the journal 6, which may be read on the scale 9 by means of thepointer 8.

According to the second method of ad justment, the distance between theaxes of the disc 1 and the journal 6 is varied, the stroke of eachpiston being equal to the double distance of the axes. I11 the diagramof Fig. 4, 0 indicates the centre of the journal 6 which may be rotatedabout the axis 1" in the cover 7; by turning the journal 6 the center ofthe journal 6 is varied between the two extreme positions 0 max. and 0min. and the effective stroke is correspondingly varied.

passages of the casing; openings in the rotated into able disc in fronof the workin faces of the prismatic isti n sliding in sai disc, andopenings in t e said rotatable disc and in the said prismatic piston infront of the second, inner prismatic piston sliding in the first namedprismatic piston, said openings connecting the working spaces of bothprismatic pistons with the passages of the distributing means.

2. In a revolving piston pump with reciprocating prismatic pistonsarranged slidably at right angles to each other in a driven discrotatably mounted inan outer casing, the inner prismatic piston beingrotatably arranged on a journal eccentrically mounted in the casing ofthe pump, the combination of distributing means on the outside of therotatable disc, the suction and discharge passages of said distributingmeans being in communication with the suction and discharge passages ofthe casin openings in the rotatable disc in front 0 y the working facesof the prismatic iston sliding 'in said disc, and openings in t e saidrotatable disc and in the said prismatic piston in front of the second,inner prismatic piston sliding in the first named prismatic piston, saidopenings connecting the working spaces of both prismatic pistons withthe passages of the distributing means, and means for altering 9relative rotation of said casing and journal, 105.

a second prismatic body enclosing said first body and slidable in saidcasing 1n a direction normal to the sliding movement of said first bodyand means for adjusting the position of said eccentric journal withrespect to the axis of said casing to vary the capacity of said pump.

4. The structure as in claim --3 wherein the means for adjusting theposition of said eccentric comprises means to vary the eccentricity ofsaid journal with respect to the axis of said asing.

5. A revolving cylinder and reciprocat ing-piston pump comprising incombination a casin a rotatable disc, a prismatic body 130 adapte toslide radially in said rotatable disc, a second prismatic body adaptedto slide radially in the first named prismatic body, the directions ofmovement of the two sliding bodies being at right angles to each other,a journal eccentrically mounted in the casing of the pump, said journalcarrying the two said prismatic bodles, a distributer sleeve surroundingsaid rotatable disc and formed with peripheral suction and dis-' chargepassages, and communication pasprovision of mea for altering thecapacity sages connecting the working spaces formed of the pump by atering the distance between 10 between the two sliding prismatic bodiesand the center of the said journal and the cenbetween the outerprismatic body and the to ter of the said rotating disc, substantially 5tating disc with said suction and discharge as described.

passa es,'substantially as described. In testimony whereof, I havesigned my 6. a revolving cylinder and reciprocatname to thisspecification. ing-piston pump according to claim 5, the EDUARD PELICH.

